Can you swing a last minute Grand Canyon trip?

Unforeseen health events are forcing a couple of people to sadly back out of a private Colorado trip. All gear and meals are set up with Moenkopi, rigging is on the 24 and launch is on the 25th of this month. We're planning takeout on Sept 9 at Diamond Creek and have the Riverhouse for the nights of 8/23 and 9/9.

A boatman (18'raft) is required and a couple of passengers or kayakers can tag along. Verifiable multi-day trips experience a definite plus.